Merge pull request #4 from WindowsAzure/dev

Merge back current dev into my fork.
Updating common, fixing null ref for add-azureaccount
Removed leftover app.config from commands.test
And more misc. app.config files deleted
Merge pull request #2235 from christav/fix-token-null-ref

Fix token null ref
Merge branch 'dev' of https://github.com/WindowsAzure/azure-sdk-tools into extensions